George v



G. F. HURT.

EXHAUSTER.

APPLICATION FILED JUNE 12, 1919.

Patented Dec. 2, 1919 av/1171A I11.

INVENTOR, Gurzgx, F. H'wW BY Rcgvw Kauai- ATTORNEYS.

UNITED STATES PATENT OFFICE.

GEORGE I. HURT, 01 ATLANTA, GEORGIA, ASSIGHOB .lO PRATT EIIIGG & MACHINEGOMPANY, OI ATLANTA, GEORGIA, A GOBIORA'I'IOH OI GEORGIA.

EXHAUST Application filed June III, 1919. Serial Io. 800,545.

To all whom it may concern.-

Be it known that I, Gnonon F. HURT, a citizen of the United States,residin at Atlanta, in the county of Fulton and tate of Geor ia, haveinvented certain new and useful In rovements in Exhausters, of which theollowing is a specification, reference being bad therein to theaccompanying drawing.

This invention is a novel exhauster, the inventive features relatingmore particularly to the structure of a centrifu al exhauster or fan, orthe blast wheel t ereof,

. adapted for exhausting or pro elling corrosive gases or fluids. Atypica instance of the use of such exhauster is to draw the gases fromthe upper art of the Glover tower of a sulfuric aci lant and propel itinto the first acid chain r of the plant, for example, as shown in mycopending application Serial No. 295,943, filed May 9, 1919. The presentinvention is shown as applied to an exhauster of'the general typedisclosed in prior patent of N. I. Pratt, 602,770, patented April 19,1898.

An object of the present invention is to afford an exhauster simple andinexpensive of construction, yet efliclent and durable in use, the lastmentioned quality depending chiefly on the protection against corrosionand the provision against distortion. It is important in apparatusses ofthis kind to prevent the gases being exhausted from coming intocontact-with corrosible metal. The best non-corrosible metals, of whichregulus metal is typical, are relatively soft and easily deformable, thementioned metal, for example, softening at a temperature of 100 C.,sufficiently to materially deform at the high speed required. Thetemperature of the gases passing from the Glover tower is e deformationtakes effect by a bending and distortion of the blades or vanes of theblast wheel, and this is minimized or overdescribed features ofimprovement, the advantage is gained that an increased suction orpressure of the gas is developed, resulting in a material increase inthe amount of gas delivered per unit of time.

To the attainment of the above referred to ob].ects and advantages, thepresent invention consists in the novel exhauster and blast wheel hereinillustrated or described, and the novel features of combination,arrangement, structure and detail thereof. In the accompanyin drawingsillustratng one form or embo iment of the present invention, Figure 1 isa side elevation of an ex hauster of the general type disclosed 1n s a1dprior atent, but improved by the addition of tie features constitutingthe present invention.

Fi 2 is a left side view of the blast wheel detac ed.

Fig. 3 is a section of the same, taken on the irregular line 33 of Fig.'2.

Fig.4 is a erspective view of the interior portion, st] enmg or corewhich is embedded in the blast wheel and serves also as a bushing orlining.

The casing 10 may take dill'erent forms. It may be as in said priorpatent, having a. removable rtion ermitting the insertion and remove ofthe last wheel. The casing is shown as havin an inlet or entry flue 11,centrally or axia y arranged, and an outlet or discharge flue 12 locatedtangentially on the periphery of the casing 10. In external bearings 13runs the shaft 14, driven by pulley 15 and carrying at its internal endthe blast wheel 16. t will be noted that the innermost bearing is asclose as pos sible to the wheel, so as to give smooth running qualities,and there is no bearing "at the. opposite or inlet side of the casing.

The blast wheel 16 is shown as having a plurality of vanes or blades.Six of these are shown, and they may be radially arranged, as seen inFig. 2. These blades 17 are formed of regulus metal. They are connectedand stiffened by a curv or hellshaped web 18, springing from the hubportion 29 in the manner shown in Fig. 3. This not merely connects andstifl'ens the blades, but facilitates the diverting of the axiallyentering gases to a centrifugal or radially outward direction. Eachblade is further stiflsned against distortion .by being formed with aperipheral rib 19 around its outline and interior ribs 20, shown in. theshape of the letter Y.

Ea h blade is thus rendered stiller against distortion, but the presenceof the ribs for this purpose increases the weight of each Patented Dec.2, 1919.

blade, and therefore the tendency to distort about the neck of theblade, that is, the point at which itsprings out from the hub. Suchdistortion is herein prevented by an embedded stilt metal part or corehavin longitudinal fins rigid relatively to the sha t and extendingoutwardly to stiffen the neck portion of each of the blades. Suchimprovement, therefore, permits the blades themselves to be stiffened bythe ribs, as described, and a blast wheel is provided which attains theadvantage before mentioned, of non-deformability, while preserving itsnoncorrosive character.

The rigid or Stiff metallic portion or core 21 is shown separately inFig. 4, and is indicated in Figs. 2 and This is preferably composed ofbronze, and it is shown as having a longitudinal keyway 22, by which itcan be keyed to the shaft, the latter having a corresponding keyway 23.The bronze member 21, it will be understood, is a unitary part of theblast wheel 16, being em bedded in and protected by the soft metal,preferably in the )rocess of forming or casting the latter. he bronzeportion 21, as stated, forms the bushing by which the blast wheel isconnected to the shaft 14, and it is held against longitudinal movementby a collar 24, formed on the shaft, and a pair of nuts 25 at thethreaded extremity of the shaft. As these parts, the shaft, the bronzeportion and the nuts are corrosible, a noncorrosible cap 26 ispreferably soldered or otherwise secured in place, as indicated in Fig.3.

The bronze core member 21 is shown as provided with. longitudinal fins27, which stand out radially, and each of these, near the point of theneck of each of the blades,

is formed with an outstanding stifl'ening flange or extension 28, which,as seen in Fig. 3, enters into the body of the soft metal at the neck ofeach blade. Each fin extension is thereby in stiffening relation to itsblade. The hub 29 of the blast wheel, composed of the soft metal,completely embeds the bronze member 21, so that the latter is whollyprotected against corrosive action.

It will thus be seen that I have thus described an exhauster and a blastwheel therefor embodying the principles and attaining the objects andadvantages of the present in ention. Since many matters of arrangement,combination, form and detail may be modified without departing from theprinciples, it is not intended to limit the present invention to suchfeatures except so far as set forth in the appended claims.

What is claimed is:

1. In or for a centrifugal exhauster for corrosive fluids. a metallicblast wheel rotatably driven within a suitable easing by a shaft, thesame comprising soft metal blades and hub. and a web connecting andst-ifi'ening said blades and each blade formed with stiffening rib atits outline.

,2. In or for a centrifugal exhauster for corrosive fluids, a metallicblast wheel rotatably driven within a suitable casing by a shaft, thesame comprising soft metal blades and hub. and a stiff metal corehavinglongitudinal fins, each extended outwardly into stiffeningrelation to one of said blades.

3. The exhauster as in claim and wherein each blade is formed with astiffening rib at its outline.

4. The exhauster as in claim 2 and wherein each blade is formed with a,stiffening rib at its outline and a Y-shape rib at its side.

5. In or for a centrifugal exhauster for corrosive fluids, a metallicblast wheel rotatably driven within a suitable casing by a. shaft, thesame eo-mprisin soft metal blades and hub, and a stilt meta coreconsisting of a lining part securable to the shaft, and'a series offilms formed thereon, each having an extension in stiffening relation toone of said blades.

In testimony whereof, I have aflixed my signature hereto.

GEORGE F. HURT.

Correction In Letters Patent No. 1,323,533-

It is hereby certified that in Letters Patent No. 1,323,533, grontedDecember 2, 1919, upon the application of George F. Hurt, of Atlanta,Georgia, for an improvement in Exheustera,' an error appears in theprinted specification requiring correction as follow: Page 2, line 88,claim 5, for the wor films reed fins; and

that the acid Letters Patent should be read with thin correction thereinthe the game may conform to the record of the one in the Patent Ofice.

Sig med end who min 131;]: day of January, A. 1)., 1920.

M. m cbULs'roN, Acting Cbmmien'm of Pa m.

